CVE-2008-5713

First published: Tue Dec 23 2008(Updated: )

From Flavio Leitner: On many core SMP machine (such as 16 core or more), soft lockup can occur when heavy network load are produced concurrently. The lockup happens at __qdisc_run()(@net/sched/sch_generic.c:line 84). Because driver continue to send packet and return NETDEV_TX_OK, __qdisc_run() can't exit from qdisc_restart() loop. This behavior may improve throughput, but some application can stuck over 10s. This issue has been fixed on vanilla kernel. Version-Release number of selected component: kernel version: 2.6.18-92.el5 (RHEL5.2GA) How reproducible: It can be reproducible in dozens of seconds, on 16 core SMP box. This issue is easy to happen, when UDP workload is very high. Steps to Reproduce: On 16 core SMP machine, execute netperf in higher than 16 parallel with the following options, then it occurs at a client side. # netperf -H &lt;netserver_address&gt; -l 60 -t UDP_STREAM -- -s 262144 -r 262144 -m 16384 Actual results: A lot of soft lockup messages are recorded into syslog, and performance problem appears in some applications. Expected results: In kernel, any CPU doesn't dedicate to some work without schedule() for a long time. Hardware info: Express5800/140Rf-4 Business impact: It makes customer's applications unresponsive too long and it makes impossible to apply RHEL5.2 to performance/latency sensitive systems. Additional info: git patch: [NET]: Add preemption point in qdisc_run <a href="http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=2ba2506ca7ca62c56edaa334b0fe61eb5eab6ab0">http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=2ba2506ca7ca62c56edaa334b0fe61eb5eab6ab0</a>

Credit: cve@mitre.org cve@mitre.org

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